Semi-blind channel estimation method based on evd-ilsp

Abstract

The invention discloses a semi-blind channel estimation method based on EVD-ILSP, which mainly solves the problem that the traditional semi-blind channel estimation method uses a limited number of sample data to cause errors to channel estimation. The implementation plan is as follows: 1) The base station of the target cell receives the data signal and the pilot signal, and solves the covariance matrix of the data signal; 2) uses the EVD algorithm to decompose the eigenvalue of the covariance matrix, and calculates the channel estimation value with ambiguity ; 3) use the base station of the target cell to receive the pilot signal of each user to solve the ambiguity factor estimate, and obtain the initial channel estimate of the target cell; 4) according to the results of 2) and 3), obtain the final channel estimate with the ILSP algorithm . The invention improves the frequency band utilization efficiency of the system, reduces channel estimation errors caused by receiving data signals with limited samples, and can be used for channel estimation between base station signals and users in a multi-cell multi-user massive MIMO system.

Description

Technical field [0001] The present invention belongs to the field of wireless communication, and in particular, to a semi-blind channel estimation method, which can be used to perform channel estimates between base station signals and users in a large-scale MIMO system in multiple cells. Background technique [0002] As the number of mobile data volume and access device of modern society, the demand for communication is getting bigger and higher in the demand for communication, and people are increasingly high. Communication technology with higher transmission speed, larger capacity, smaller energy consumption, and higher security, and higher security have become a focused hotspot in the field of current communication research. Large-scale MIMO has high spectrum utilization, low power, less delay, etc., so it is one of the core technologies of next-generation mobile communications. [0003] Pilot contamination problems caused by pilot multiplexing between various cell users in mu...

AI Technical Summary

Problems solved by technology

[0004] In 2007, B.Muquet proposed a semi-blind channel estimation method based on the EVD algorithm. However, in the actual massive MIMO system, the system channel is not completely orthogonal due to the limited number of base station antennas in space, and limited samples are used. The received data replaces the real channel data, which makes the channel estimation of the multi-cell multi-user massive MIMO system have a large error

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